Keep pets safe on night-time walks! LED light clips on easily to collars or leashes with sturdy spring clip, features three modes (solid, fast flashing, slow flashing), takes (1) replaceable CR2032 button cell battery (included). Your purchase makes a difference! Your support enables us to help K9s For Warriors empower service members with the invisible wounds of war return to civilian life with dignity and independence. Learn more at www.K9sForWarriors.org